4.6 Article

The second extension of the International Celestial Reference Frame: ICRF-EXT.1

Journal

ASTRONOMICAL JOURNAL
Volume 127, Issue 6, Pages 3587-3608

Publisher

IOP PUBLISHING LTD
DOI: 10.1086/420998

Keywords

astrometry; catalogs; quasars : general; radio continuum : galaxies; reference systems; techniques : interferometric

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We use very long baseline interferometry data obtained between mid-1995 and the end of 2002 May together with older data to extend and revise the International Celestial Reference Frame ( ICRF). Revised positions of ICRF candidate and other'' sources, based on inclusion of the additional data, are presented. Positions, in the frame of the ICRF, for an additional 109 new sources are also presented. All but four of the new sources are located north of delta = -30degrees. Positions of the ICRF defining sources remain unchanged. We present a summary of current astrometric and geodetic observing programs and discuss the evolution and future of the ICRF.

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